From 9e6d35490a6542f9c97607f93c2ef8ca8e03cbcc Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Wed, 6 Jan 2016 20:12:03 +0000
Subject: Vendor import of lldb trunk r256945:
 https://llvm.org/svn/llvm-project/lldb/trunk@256945

---
 source/Host/linux/LibcGlue.cpp | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 source/Host/linux/LibcGlue.cpp

(limited to 'source/Host/linux/LibcGlue.cpp')

diff --git a/source/Host/linux/LibcGlue.cpp b/source/Host/linux/LibcGlue.cpp
new file mode 100644
index 0000000000000..63d026f76c628
--- /dev/null
+++ b/source/Host/linux/LibcGlue.cpp
@@ -0,0 +1,30 @@
+//===-- LibcGlue.cpp --------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// This file adds functions missing from libc on older versions of linux
+
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <lldb/Host/linux/Uio.h>
+#include <cerrno>
+
+#ifndef HAVE_PROCESS_VM_READV // If the syscall wrapper is not available, provide one.
+ssize_t process_vm_readv(::pid_t pid,
+			 const struct iovec *local_iov, unsigned long liovcnt,
+			 const struct iovec *remote_iov, unsigned long riovcnt,
+			 unsigned long flags)
+{
+#ifdef HAVE_NR_PROCESS_VM_READV // If we have the syscall number, we can issue the syscall ourselves.
+    return syscall(__NR_process_vm_readv, pid, local_iov, liovcnt, remote_iov, riovcnt, flags);
+#else // If not, let's pretend the syscall is not present.
+    errno = ENOSYS;
+    return -1;
+#endif
+}
+#endif
-- 
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